2005 Mercedes S-Class Owner's Manual - Page 390
2005 Mercedes S-Class Manual
Page 390 highlights
Practical hints Replacing SmartKey batteries SmartKey with KEYLESS-GO* Remove mechanical key out of the SmartKey ( page 383). Replacement battery: Lithium, type CR 2025 or equivalent. Insert the mechanical key 3 in side opening and push gray slide. The battery compartment is unlatched. 3 Battery 4 Contact spring Using a lint-free cloth, insert new batteries 3 under the contact spring 4 with the plus (+) side facing up. Return battery compartment 2 into housing until it locks into place. Slide mechanical key 1 back into the SmartKey. Check the operation of the SmartKey. Pull the battery compartment out of the SmartKey housing. 1 Battery 2 Tilt battery up 3 Mechanical key Using mechanical key 3, apply pressure to position 2. Battery 1 tilts up slightly. Pull out battery 1 in direction of arrow. Using a lint-free cloth, insert the new battery with the plus (+) side facing up. Return battery compartment into housing until it locks into place. Slide mechanical key 1 back into the SmartKey. Check the operation of KEYLESS-GO*. i When inserting the battery, make sure they are clean and free of lint. i The required replacement battery is available at any authorized Mercedes-Benz Center. 388
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